水平位置对突扩通道内横掠圆管对流换热的影响

摘要

采用非稳态数学模型对突扩通道内横掠圆管流动与换热进行了数值模拟.分别对不同雷诺数Re以及圆柱的不同水平位置情况进行数值模拟.结果表明,随着Re的变化,数值解有稳态和周期振荡.同时随着雷诺数的增加,圆管附近的换热不断增强.对于圆管不同的位置,当10≤Re<100和Re=300时,圆管的换热随着Xc的增加而变弱;当100≤Re≤200时,圆管换热并不单调减弱.%A numerical simulation was performed by adopting unsteady mathematical mode for the fluid flow and convection heat transfer around a circular cylinder confined in a sudden expansion channel.The simulations were carried out under different Reynolds numbers Re and horizontal positions of the circular cylinder Xc.It was found that the numerical solutions were steady state and periodical oscillatory with the change of Reynolds number.Meanwhile, the heat transfer around the cylinder was enhanced obviously with the increase of Reynolds number.The heat transfer around the cylinder was weakened with the increasing value of Xc when 10≤Re≤100 and Re=300, but when 100